Engineering Materials Practice Set-8

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1. The crystal structure of brass is

Orthorhombic crystalline structure

H.C.P.

B.C.C.

F.C.C.

2. Which is false statement about tempering? Tempering is done to

Improve ductility

Release stresses

Improve machinability

Improve toughness

3. Gun metal contains

85 - 92% copper and rest tin with little lead and nickel

70 - 78% copper and rest tin

70% copper and 30% zinc

90% copper and 10% tin

4. The hardness is the property of a material due to which it

Can cut another metal

Breaks with little permanent distortion

Can be rolled or hammered into thin sheets

Can be drawn into wires

5. Which of the following is used for bearing liner?

Babbitt metal

Bell metal

Gun metal

Bronze

6. Aluminium bronze contains aluminium and copper in the ratio of

60 : 40

50 : 50

10 : 90

40 : 60

7. The alloying element which reduces the formation of iron sulphide in steel is

Chromium

Nickel

Vanadium

Manganese

8. The hardness of steel increases if it contains

Pearlite

Cementite

Austenite

Martensite

9. Cupola produces following material

Pig iron

Cast iron

Malleable iron

Wrought iron

10. Beryllium bronze has

(A) High yield point

(D) None of these

(C) Both (A) and (B)

(B) High fatigue limit

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11. Permalloy is a

None ferrous alloy

Polymer

Nickel and iron alloy having high permeability

Kind of stainless steel

12. Weld decay is the phenomenon found with

Stainless steel

Nonferrous materials

Mild steel

Cast iron

13. Nimonic contains __________ percentage of nickel as that of Inconel.

Less

More

None of these

Same

14. Delta metal is an alloy of

Iron, lead and tin

Copper, zinc and iron

Iron, nickel and copper

Iron, aluminium and magnesium

15. Argentite is the principal ore or raw material for

Silver

Tin

Zinc

Aluminium

16. Which of the following is the binding material in cemented carbides?

Cobalt

Vanadium

Nickel

Iron

17. The presence of sulphur in pig iron makes

The casting unsound

It hard

It easily machinable

It brittle

18. Corrosion resistance of steel is increased by adding

Chromium and nickel

Tungsten and sulphur

Aluminium and zinc

Nickel and molybdenum

19. High carbon steel carries carbon percentage

0.8 to 1.5%

0.6 to 0.8%

0.1 to 0.3%

0.3 to 0.6%

20. Carbon in iron is an example of

Interstitial solid solution

Substitutional solution

All of the above

Intermetallic compounds

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21. The machinability of steel is increased by

Silicon and sulphur

Phosphorous and aluminium

Sulphur, graphite and aluminium

Phosphorous, lead and sulphur

22. Bronze contains

70 - 75% copper and rest tin

85 - 92% copper and rest tin with little lead and nickel

70% copper and 30% zinc

90% copper and 10% tin

23. Melting point of iron is

1601°C

1539°C

1712°C

1489°C

24. Steel made from phosphate iron is

Ductile

Hard

Brittle

Tough

25. Compressive strength of grey cast iron in tonnes/cm is of the order of

57

710

1015

35

26. An example of amorphous material is

Glass

Lead

Silver

Zinc

27. Preheating is essential in welding

High speed steel

All nonferrous materials

All of the above

Cast iron

28. Tungsten in high speed steel provides

Hot hardness

Sharp cutting edge

Toughness

Wear resistance

29. Connecting rod is usually made of

Low carbon steel

Medium carbon steel

Aluminium

High carbon steel

30. Hardness of upper bainite (acicular structure) is about

RC 48

RC 65

RC 57

RC 80

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31. Free cutting steels

Are used where ease in machining is the criterion

Require least cutting force

Contain carbon in free form

Do not exist

32. Sulphur in cast iron

Aids fusibility and fluidity

Makes the iron soft and easily machinable

Make the iron white and hard

Increases hardness and brittleness

33. Phosphor bronze contains

2.5% phosphorous

None of the above

0.5% of phosphorous

1% phosphorous

34. Drop forging dies contain carbon of the order of

0.6 to 0.7%

0.7 to 0.9%

0.1 to 0.2%

0.25 to 0.5%

35. Shock resisting steels should have

Low hardness

Low tensile strength

Toughness

Low wear resistance

36. Perminvar alloy having constant permeability is an alloy of

Iron, zinc and bismuth

Nickel, copper and iron

Nickel, copper and zinc

Copper, nickel and antimony

37. Manganese in steel increases its

Hardness

Fluidity

Tensile strength

Ductility

38. Cold rolled steel sheets contain carbon of the following order

0.4%

0.6%

0.2%

0.1%

39. Chromium in steel

Improves cutting ability and reduces hardenability

Improves wear resistance, cutting ability and toughness

Refines grain size and produces less tendency to carburisation, improves corrosion and heat resistant properties

Gives ductility, toughness, tensile strength and anti-corrosion properties

40. The alloy used for making electrical resistances and heating elements is

Magnin

Invar

Elinvar

Nichrome

Engineering Materials Practice Set-8

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